This research is supported by the National Natural Science Foundation of China(国家自然科学基金,Nos.19771045,19931020)(and the National High Technology Development Program of China国家863高科技项目基金,No.863-306-ZT06-01-2)
赵希顺,丁德成.若干限制形式的缺省推理的复杂性.软件学报,2000,11(7):881-888
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